Just to try, I did the same thing with a UNMODIFIED Mc360, same thing happens (Rarely).
Try this. Try Randomly unplugging the ethernet, while changing the blades or Stay on Movie Trailers button. Unplug and plug. There u will c it by yourself.
1 more intresting thing is that, once you start navingating through the panels, the seperator reappears.
Regarding the Clear Cache, its made my myself. [except for the actual script which does]
And the other is Temperature mod & Logo thing.